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Fair value measurements and Hedging - Fair value on a recurring basis - Significant Other Observable Inputs (Table) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
ASSETS |  |
asset position | $ 1,637 | $ 77
Significant Other Observable Inputs (Level 2) | Designated as cash flow hedges |  |
ASSETS |  |
Total | 130 | 0
LIABILITIES |  |
Total | 0 | 16
Significant Other Observable Inputs (Level 2) | Not designated as cash flow hedges |  |
ASSETS |  |
Total | 1,507 | 77
LIABILITIES |  |
Total | 1,080 | 609
Bunker swaps | Significant Other Observable Inputs (Level 2) | Not designated as cash flow hedges |  |
ASSETS |  |
asset position | 1,507 | 60
Forward freight agreements | Significant Other Observable Inputs (Level 2) | Not designated as cash flow hedges |  |
ASSETS |  |
asset position |  | 17
LIABILITIES |  |
liability position | 1,080 |
Interest rate swaps | Significant Other Observable Inputs (Level 2) | Designated as cash flow hedges |  |
ASSETS |  |
asset position | $ 130 |
LIABILITIES |  |
liability position |  | 16
Interest rate swaps | Significant Other Observable Inputs (Level 2) | Not designated as cash flow hedges |  |
LIABILITIES |  |
liability position |  | $ 609

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